Sökning: "clouds - ISM"

Visar resultat 1 - 5 av 13 avhandlingar innehållade orden clouds - ISM.

  1. 1. Satellite and ground based observations of massive star forming regions

    Författare :Henrik Olofsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; abundances - ISM; ISM; clouds - ISM; jets and outflows - ISM; ISM - Submillimeter; molecules - Radio lines;

    Sammanfattning : Results from submm/mm radio astronomical observations, using the astronomy/-aeronomy satellite Odin and the 20m telescope at the Onsala Space Observatory, are presented. Analysis of spectroscopic data of interstellar rotational emission lines from gaseous H2O residing in giant molecular clouds (GMCs), reveal important new clues about the chemistry and spatial distribution of water molecules in these regions, including estimates of the water abundance in molecular outflows associated with massive star formation. LÄS MER

  3. 2. Extinction in Molecular Clouds : Case of Barnard 335

    Författare :Sven Olofsson; Göran Olofsson; Kalevi Mattila; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ISM; interstellar medium; extinction; molecular cloud; Astronomy; astronomi; Astronomy; astronomi;

    Sammanfattning : The Bok globule B335 is a small molecular cloud in the solar neighbourhood near the galactic plane. The aim for this three-paper-study is to construct and analyze the extinction for this globule. The method we apply is to use the light from field stars behind the cloud in broadband filters ranging from UV to the mid-infrared. LÄS MER

  4. 3. Chemodynamics in Star-Forming Molecular Clouds

    Författare :Chia-Jung Hsu; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stars: formation; hydrodynamics; methods: numerical; ISM: clouds; astrochemistry;

    Sammanfattning : Stars are fundamental building blocks of galaxies. However, the answers to many basic questions about their formation remain elusive. There is no consensus on a theory that can predict the rate of star formation, its clustering properties, and the conditions needed for massive stars to be born. LÄS MER

  5. 4. Chemodynamical Simulations of Star-Forming Molecular Clouds

    Författare :Chia-Jung Hsu; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; methods:numerical; magnetohydrodynamics; stars:formation; astrochemistry; ISM:clouds;

    Sammanfattning : Stars are known to form from dense, dusty clumps and cores of molecular clouds. However, there is no consensus on a theory that can predict the rate of star formation, its clustering, and the conditions needed for massive stars to be born. A major challenge is how to observe and characterise the gas that is the fuel for star formation. LÄS MER

  7. 5. Astrochemical Investigations of Complex Organics in Cold Molecular Cloud Cores

    Författare :Tadeus Carl; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; astrobiology; astrochemistry; ISM – molecular clouds; ISM – molecules; dark clouds;

    Sammanfattning : Astrochemistry is the study of the formation and evolution of molecules in the interstellar medium (ISM) of the Milky Way and other galaxies. Molecules start to accumulate in the coldest and densest regions of the ISM, namely molecular clouds, and as of this date, 307 interstellar molecules are identified. LÄS MER